Viewing archive of Thursday, 23 April 2026
Solar activity report
Report of Solar-Geophysical Activity 2026 Apr 23 2200 UTCPrepared by the NOAA © SWPC and processed by SpaceWeatherLive.com
Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 113 Issued at 2200Z on 23 Apr 2026IA. Analysis of Solar Active Regions and Activity from 22-2100Z to 23-2100Z Solar activity has been at high levels for the past 24 hours.
There are currently 4 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is likely to be moderate
with a slight chance for an X-class flare on days one, two, and three
(24 Apr, 25 Apr, 26 Apr).
IIA. Geophysical Activity Summary 22-2100Z to 23-2100Z
The geomagnetic
field has been at quiet to unsettled levels for the past 24 hours. Solar
wind speed reached a peak of 496 km/s at 23/0352Z. Total IMF reached 5
nT at 22/2101Z. The maximum southward component of Bz reached -5 nT at
22/2218Z. Electrons greater than 2 MeV at geosynchronous orbit reached
a peak level of 4058 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected
to be at quiet to unsettled levels on day one (24 Apr), quiet to active
levels on day two (25 Apr) and quiet to minor storm levels on day three
(26 Apr). Protons have a slight chance of crossing threshold on days
one, two, and three (24 Apr, 25 Apr, 26 Apr).
III. Event Probabilities 24 Apr to 26 Apr
| Class M | 55% | 60% | 60% |
| Class X | 10% | 15% | 15% |
| Proton | 10% | 10% | 10% |
| PCAF | green | ||
IV. Penticton 10.7 cm Flux
Observed 23 Apr 128 Predicted 24 Apr-26 Apr 135/135/132 90 Day Mean 23 Apr 129
V. Geomagnetic A Indices
Observed Afr/Ap 22 Apr 004/005 Estimated Afr/Ap 23 Apr 009/010 Predicted Afr/Ap 24 Apr-26 Apr 009/008-011/012-016/022
VI. Geomagnetic Activity Probabilities 24 Apr to 26 Apr
| A. Middle Latitudes | |||
|---|---|---|---|
| Active | 20% | 30% | 40% |
| Minor storm | 05% | 05% | 25% |
| Major-severe storm | 01% | 01% | 01% |
| B. High Latitudes | |||
|---|---|---|---|
| Active | 15% | 15% | 10% |
| Minor storm | 25% | 30% | 25% |
| Major-severe storm | 25% | 35% | 60% |
All times in UTC
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Space weather facts
| Last X-flare | 2026/07/04 | X1.3 |
| Last M-flare | 2026/07/12 | M1.19 |
| Last geomagnetic storm | 2026/07/04 | Kp7+ (G3) |
| Spotless days | |
|---|---|
| Last 365 days | 3 days |
| 2026 | 3 days (2%) |
| Last spotless day | 2026/02/24 |
| Monthly mean Sunspot Number | |
|---|---|
| June 2026 | 94.4 -7.1 |
| July 2026 | 77.9 -16.5 |
| Last 30 days | 89.1 -18 |
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